Open-front, thermal underwear



FIG. 1 is a perspective view of an open-front, thermal underwear showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in FIGS. 1-7 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an open-front, thermal underwear, as shown and described. 